Density of states within the Coulomb gap

1987 ◽  
Vol 97-98 ◽  
pp. 483-486 ◽  
Author(s):  
Arnulf Möbius ◽  
Manuel Richter
Keyword(s):  
Density Of States ◽  
Coulomb Gap

Corrections to the one-dimensional density of states: Observation of a Coulomb gap?

1986 ◽  
Vol 56 (5) ◽  
pp. 532-535 ◽  
Author(s):  
Alice E. White ◽  
R. C. Dynes ◽  
J. P. Garno
Keyword(s):  
Density Of States ◽  
One Dimensional ◽  
Coulomb Gap ◽  
The One

Coulomb Gap in the Tunneling Density of States of Two-Dimensional Electron Liquid in a Strong Magnetic Field

1994 ◽  
Vol 08 (07) ◽  
pp. 913-921
Author(s):  
A.L. Efros ◽  
F.G. Pikus
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Density Of States ◽  
Tunneling Current ◽  
Double Quantum ◽  
Two Dimensional ◽  
Classical Electron ◽  
Coulomb Gap ◽  
Double Quantum Well ◽  
Single Well

A model of a classical electron liquid without external disorder is applied to two-dimensional electrons in a strong magnetic field. Computer modeling gives a quantitative explanation for the recently observed gap in the tunneling current of a double quantum well structure. We find that both the Coulomb gap in the single-well density of states and the correlation of electron motion in the two wells are responsible for the tunneling gap. We show that the classical liquid model provides an accurate description of the low temperature compressibility obtained from magnetocapacitance experiment.

DENSITY OF STATES AND CHARGE DISTRIBUTION IN LIGHTLY DOPED AND COMPENSATED QUANTUM WELL

1989 ◽  
Vol 03 (11) ◽  
pp. 815-819
Author(s):  
E.A. DE ANDRADA E SILVA ◽  
I.C. DA CUNHA LIMA
Keyword(s):  
Quantum Well ◽  
Charge Distribution ◽  
Density Of States ◽  
Impurity Band ◽  
Band Model ◽  
Two Dimensional ◽  
Bohr Radius ◽  
Coulomb Gap ◽  
Bulk Semiconductors ◽  
Infra Red

In this letter we use a Semi-Classical Impurity Band Model and obtain by Monte Carlo simulation the density of states (DOS) and the impurity charge distribution inside a quantum well (QW) of Ga 1−x Al x As/GaAs . We show the existence of a Coulomb gap as has been observed in bulk semiconductors. The DOS is not very sensitive to the QW width close to the Coulomb gap, at least in the range from 1 to 4 times the Bohr radius, and shows a behavior D(E)∝|E−EF| which indicates a two-dimensional signature. We show that the neutral donors concentrate in the center of the well according to a distribution whose width and decay rate depend on the compensation and impurity concentration respectively. Those effects are expected to be observed by infra-red absorption experiments and useful in device diagnosis.

The density of states in the Coulomb gap

1985 ◽  
Vol 52 (3) ◽  
pp. 511-520 ◽  
Author(s):  
J. H. Davies
Keyword(s):  
Density Of States ◽  
Coulomb Gap

Coulomb gap in the density of states of Ising dipoles in an external magnetic field

1997 ◽  
Vol 56 (21) ◽  
pp. 13943-13953
Author(s):  
D. A. Parshin ◽  
A. Equibian ◽  
G. Bellessa
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Density Of States ◽  
Coulomb Gap

HOPPING CONDUCTION AT VERY LOW TEMPERATURES: SOME NEW RESULTS ON AN OLD PROBLEM

1993 ◽  
Vol 07 (05) ◽  
pp. 265-269
Author(s):  
PEIHUA DAI ◽  
YOUZHU ZHANG ◽  
M. P. SARACHIK
Keyword(s):  
Magnetic Field ◽  
Temperature Dependence ◽  
Density Of States ◽  
Low Temperatures ◽  
Zero Magnetic Field ◽  
Strong Temperature Dependence ◽  
Hopping Conduction ◽  
Doped Semiconductors ◽  
Metal Insulator ◽  
Coulomb Gap

We briefly review the temperature dependence of hopping conduction in doped semiconductors near the metal-insulator transition, with emphasis on recent experimental results in Si:B at very low temperatures. Our main finding is that at sufficiently low temperature the conduction is simply activated in zero magnetic field, indicating the presence of a "hard" gap in the density of states. A magnetic field suppresses this unexpectedly strong temperature dependence, changing it to the variable-range-hopping form expected for a "soft" Coulomb gap. This suggests that the density of states is determined by electron correlations due to exchange as well as charge.

Sign in / Sign up

Export Citation Format

Share Document